I think the reasoning behind this is true, but that doesn't necessarily mean it's always-applicable advice. Longhand doesn't allow for the same degree of self-editing, but if one struggles with actually getting the words onto the page, then it's probably a good thing.

If you're like me and CAN'T STAND TO HAVE MESSY SCRIBBLE PAGE, then...not so much.

Either way, writing longhand is good for you, because the operative word here is "writing," and it definitely beats sleeping through your pharmacology class.